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Rochechouart impact structure or Rochechouart astrobleme is an impact structure in France. Erosion has over the millions of years mostly destroyed its impact crater , the initial surface expression of the asteroid impact leaving highly deformed bedrock and fragments of the crater's floor as evidence of it.
These are used for screening and tracking study of possible impact sites. Sites will appear first in these lists while under study and may be incorporated into UNB's Earth Impact Database after confirmation and collection of enough information about the site to satisfy the database's strict entry criteria. [2]
The EID lists fewer than ten such craters, and the largest in the last 100,000 years (100 ka) is the 4.5 km (2.8 mi) Rio Cuarto crater in Argentina. [2] However, there is some uncertainty regarding its origins [3] and age, with some sources giving it as < 10 ka [2] [4] while the EID gives a broader < 100 ka. [3]
Rochechouart is situated in the Rochechouart impact structure, an impact crater caused by an asteroid that crashed into the Earth's surface about 205 million years ago, [9] [10] in the Rhaetian period, shortly before the Triassic Jurassic boundary characterized by a massive extinction event in which 80% of the world's species were obliterated. [11]
The following structures are officially considered "unconfirmed" because they are not listed in the Earth Impact Database. Due to stringent requirements regarding evidence and peer-reviewed publication, newly discovered craters or those with difficulty collecting evidence generally are known for some time before becoming listed.
This list includes all 60 confirmed impact structures in North America in the Earth Impact Database (EID). These features were caused by the collision of large meteorites or comets with the Earth.
Destiny 2: The Final Shape is a major expansion for Destiny 2, a first-person shooter video game by Bungie.Representing the eighth expansion and the seventh year of extended content for Destiny 2 and 10th year of content for the Destiny franchise, it was released on June 4, 2024, after being delayed from its original February 2024 date.
Another impact crater, the much smaller (3.8 km (2.4 mi) diameter) Steinheim crater, [12] is located about 42 km (26 mi) west-southwest from the center of Ries. It had previously been thought that the two craters formed simultaneously by the impact of a binary asteroid 14.8 million years ago, but a study published in 2020 suggests that ...